Can you get three-of-a-kind on this slot machine? Let's find out!
nc misc.bcactf.com 49156 Copy
Hint 1 of 4
There's got to be a faster way than to connect manually, right?
Hint 2 of 4
Can you use a tool to make your computer connect for you?
Hint 3 of 4
The flag is in the format bcactf{...}. Use that to your advantage when parsing output.
Hint 4 of 4
Once you're connecting as fast as you can, how can you get even more connections?
ncでアクセスしてみるとキーを押せと言われ謎のスピンが始まる。
$ nc misc.bcactf.com 49156
/$$ /$$
| $$ | $$
| $$ /$$ /$$ /$$$$$$$| $$ /$$ /$$ /$$
| $$ | $$ | $$ /$$_____/| $$ /$$/| $$ | $$
| $$ | $$ | $$| $$ | $$$$$$/ | $$ | $$
| $$ | $$ | $$| $$ | $$_ $$ | $$ | $$
| $$$$$$$$| $$$$$$/| $$$$$$$| $$ \ $$| $$$$$$$
|________/ \______/ \_______/|__/ \__/ \____ $$
/$$ | $$
| $$$$$$/
\______/
/$$ /$$ /$$
| $$ | $$ | $$
| $$ /$$$$$$ /$$$$$$ /$$$$$$ /$$$$$$
| $$ /$$__ $$|_ $$_/|_ $$_/ /$$__ $$
| $$ | $$ \ $$ | $$ | $$ | $$ \ $$
| $$ | $$ | $$ | $$ /$$| $$ /$$| $$ | $$
| $$$$$$$$| $$$$$$/ | $$$$/| $$$$/| $$$$$$/
|________/ \______/ \___/ \___/ \______/
Welcome to the Lucky Lotto Slot Machine!
Let's see if you're today's big winner!
Enter the letter "d" to pull the lever...
d
Spinning...
[[[ e ]]]
[[[ p ]]]
[[[ i ]]]
You didn't win anything. Try matching more letters next time!
Come back next time!揃えばよいと思われるが、実行から結果が出るまで少しの時間が必要なようだ。
また、キーは実行ごとに任意の小文字アルファベットが指定されるようだ。
以下のsssssssssspin.shを用いて一度に複数回実行すればよい。
echo -e "abcdefghijklmnopqrstuvwxyz\n" | nc misc.bcactf.com 49156 | grep ctf &
echo -e "abcdefghijklmnopqrstuvwxyz\n" | nc misc.bcactf.com 49156 | grep ctf &
~~~
echo -e "abcdefghijklmnopqrstuvwxyz\n" | nc misc.bcactf.com 49156 | grep ctf &
echo -e "abcdefghijklmnopqrstuvwxyz\n" | nc misc.bcactf.com 49156 | grep ctf &実行する。
$ ./sssssssssspin.sh
$ bcactf{y0u_g0t_1ucKy_af23dd97g64n}flagが出力された。